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is a significant concern for physicians. Central% z0 |5 I3 z( E A' j0 K
precocious puberty (CPP), which is mediated1 X" ~- F) O: Z l( d
through the hypothalamic pituitary gonadal axis, has$ o0 @8 V! R/ N
a higher incidence of organic central nervous system
1 t- _/ y' d. {/ _7 a" o/ olesions in boys.1,2 Virilization in boys, as manifested& U" x1 t& R3 j: w. }9 k
by enlargement of the penis, development of pubic
5 I% w) W; b+ B8 T" ]1 qhair, and facial acne without enlargement of testi-
5 t4 ?: {# d7 S# s$ Ecles, suggests peripheral or pseudopuberty.1-3 We
5 G! O v9 k# creport a 16-month-old boy who presented with the
7 B7 A6 R3 @( h+ {9 Genlargement of the phallus and pubic hair develop-
- G1 s7 n9 b, ?) @2 \) X0 }ment without testicular enlargement, which was due
8 | u5 {4 I* e0 `to the unintentional exposure to androgen gel used by
& `) N2 l- {6 O$ c% zthe father. The family initially concealed this infor-
/ F" I: ?. N3 u2 g# Dmation, resulting in an extensive work-up for this
1 [. D, y' \# ?1 g8 d% Bchild. Given the widespread and easy availability of
% X) n9 c$ z1 @7 ?1 M, ~9 ttestosterone gel and cream, we believe this is proba-$ ?' Z9 { h4 R- r9 n
bly more common than the rare case report in the' p V- W# g& o* N" z, q+ E
literature.4
% r$ b9 I) N4 R" n9 Z# W: l6 u, ?Patient Report
% n1 Y" l* v3 t" q9 lA 16-month-old white child was referred to the
) y8 ?: o! M2 O8 _7 hendocrine clinic by his pediatrician with the concern
& X7 q6 l! `8 a: kof early sexual development. His mother noticed
6 r3 `. {6 V* t. R; G8 [$ alight colored pubic hair development when he was, O1 V0 o) D( L
From the 1Division of Pediatric Endocrinology, 2University of6 O. W; W# ~ E
South Alabama Medical Center, Mobile, Alabama.2 P. q& v# L" d5 L
Address correspondence to: Samar K. Bhowmick, MD, FACE,
. r1 z" |- \8 j& F$ X1 s }Professor of Pediatrics, University of South Alabama, College of0 w! w7 X% l+ g( {. E
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
1 G8 |( t9 t; R v/ N2 ]* D4 ge-mail: [email protected].2 N7 _/ u: U) \( j
about 6 to 7 months old, which progressively became
& m/ U& |. u6 H, L0 f; g( |2 ?darker. She was also concerned about the enlarge-* D" @6 O/ k. i2 q; `
ment of his penis and frequent erections. The child% t9 ~" Y: X; h6 R& Y- Y
was the product of a full-term normal delivery, with4 \( }& n. `% [# `- Y& }
a birth weight of 7 lb 14 oz, and birth length of
- m0 w# y: C' o8 c: L20 inches. He was breast-fed throughout the first year7 v( b: `' @. B B9 ]6 F2 I
of life and was still receiving breast milk along with& z. F" {" }' D5 V
solid food. He had no hospitalizations or surgery,. }3 p1 ^2 K Z4 B2 @+ h/ I
and his psychosocial and psychomotor development
: `! f1 U9 i( x2 R5 Uwas age appropriate.' Z) A; S4 I5 Q7 I! O- q
The family history was remarkable for the father,5 m3 r" l3 p( l& t: L/ l. C+ f0 _
who was diagnosed with hypothyroidism at age 16,- ?: l4 x) z, d' a& p: M
which was treated with thyroxine. The father’s
) M, _& L* t6 l1 N) R. hheight was 6 feet, and he went through a somewhat
& a, ]' V) D, f0 G8 Gearly puberty and had stopped growing by age 14.
/ R' E. v+ w7 ]The father denied taking any other medication. The
1 p& P1 t+ D. w qchild’s mother was in good health. Her menarche
& Q1 i( t8 @0 [* d5 Twas at 11 years of age, and her height was at 5 feet
9 a6 z+ i! E1 {8 P0 P) F5 inches. There was no other family history of pre-! `# V# \& M. `! V; u$ T
cocious sexual development in the first-degree rela-* G; A7 s/ O2 {3 n4 c! ?
tives. There were no siblings.( T. n, u# u7 ]4 x4 J
Physical Examination, g# x* e* c& H9 G0 L V
The physical examination revealed a very active,
" H# c2 P" I) S7 {8 q& f v, f$ m- dplayful, and healthy boy. The vital signs documented
4 G9 A9 y# i0 ?5 u& `) ^$ I/ Fa blood pressure of 85/50 mm Hg, his length was
( S" y4 z' }/ E! R* `9 K$ O1 K6 B* E90 cm (>97th percentile), and his weight was 14.4 kg2 j, b/ N7 {7 R& T+ j8 |
(also >97th percentile). The observed yearly growth
1 O" Z5 u m; \0 q+ \0 Lvelocity was 30 cm (12 inches). The examination of: i- b( [! t& x5 e8 I; R4 A6 G w
the neck revealed no thyroid enlargement.
, ?7 C t" N5 J( lThe genitourinary examination was remarkable for
4 E$ z- ^/ R l4 Y9 X3 lenlargement of the penis, with a stretched length of F3 M. b* N7 ?2 P# o H
8 cm and a width of 2 cm. The glans penis was very well: Y4 T) c, |, i& K
developed. The pubic hair was Tanner II, mostly around7 e* N2 u' }, \! m- ]
5403 X1 v2 s+ w0 V- U
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; R% ?# ^) a$ n; K* r0 @% L: hthe base of the phallus and was dark and curled. The+ E6 w* W- I) X# c5 K
testicular volume was prepubertal at 2 mL each.) L# b' u$ B8 A) Y4 y) e
The skin was moist and smooth and somewhat
/ x" y N. @1 V. O+ Foily. No axillary hair was noted. There were no5 u6 V2 i! q* p! }
abnormal skin pigmentations or café-au-lait spots.' X& A4 k9 A& c6 H+ l4 w
Neurologic evaluation showed deep tendon reflex 2+
1 O: T- m$ O6 c9 j$ m5 Ubilateral and symmetrical. There was no suggestion
! x0 A- r: b: c. U7 fof papilledema.9 m- H1 c4 m$ ^2 [
Laboratory Evaluation' g: F2 @" z1 L
The bone age was consistent with 28 months by2 S$ h' o7 n9 C) I
using the standard of Greulich and Pyle at a chrono-, M. x+ j! o/ y8 b+ l7 y- Y, f
logic age of 16 months (advanced).5 Chromosomal
5 y% w; m- T v1 x, K2 @karyotype was 46XY. The thyroid function test
5 x: X R9 o$ s$ |: ?showed a free T4 of 1.69 ng/dL, and thyroid stimu-$ @' I2 H( j, G1 U
lating hormone level was 1.3 µIU/mL (both normal).3 {/ C" n: {' P- ^. o
The concentrations of serum electrolytes, blood
% G& b# |7 ?0 c0 o: g9 xurea nitrogen, creatinine, and calcium all were2 K5 @, |1 v5 [) z q. {6 W$ Q5 v
within normal range for his age. The concentration
8 _+ b# p) g- J( k) b q$ h& H* Zof serum 17-hydroxyprogesterone was 16 ng/dL% A) d. Q$ B: \3 {% u9 p1 ^
(normal, 3 to 90 ng/dL), androstenedione was 20
1 y: a7 e. n% C% Y7 A' r& L6 ]ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
+ z2 c `5 g% dterone was 38 ng/dL (normal, 50 to 760 ng/dL),
5 S6 c" Q; o& N3 n0 cdesoxycorticosterone was 4.3 ng/dL (normal, 7 to; K: _- R+ B# U
49ng/dL), 11-desoxycortisol (specific compound S)8 l# |3 x* B8 r
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
* P1 d- g. p3 H4 q j! X0 stisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total$ O* c4 p- B$ b4 f& r! r4 h
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),4 |9 Y1 P2 Q5 X9 A S, |8 _& ^
and β-human chorionic gonadotropin was less than
$ J& V2 d. ]' A5 mIU/mL (normal <5 mIU/mL). Serum follicular
/ Q3 E' S4 I+ bstimulating hormone and leuteinizing hormone
! f5 F' J# W6 J- Tconcentrations were less than 0.05 mIU/mL( h/ J9 ~" O2 g
(prepubertal).
% ~/ q2 M& s7 d* s7 Q# ZThe parents were notified about the laboratory
+ D$ C; z) R6 M) @8 C: {results and were informed that all of the tests were/ K% V0 c9 u" s2 `6 @9 ]
normal except the testosterone level was high. The
: D6 o6 f, B) Z( @follow-up visit was arranged within a few weeks to
, H( i( D' J6 ]obtain testicular and abdominal sonograms; how-
. N. }6 [* L5 k2 j+ r' ]ever, the family did not return for 4 months.! [9 j; o" p; c3 b$ \3 T& ~& p( u
Physical examination at this time revealed that the
' r, F- ^- w& E) wchild had grown 2.5 cm in 4 months and had gained( ~3 y9 H' W: {' ~7 _' z
2 kg of weight. Physical examination remained( C# e5 d5 \, c2 `2 G: a9 a! ]
unchanged. Surprisingly, the pubic hair almost com-
* ]& j- a M" m0 Qpletely disappeared except for a few vellous hairs at
. y) `! @. J' r" J) O0 G$ g/ Mthe base of the phallus. Testicular volume was still 2% T& U3 Y6 ]! ^7 t7 H; T" d% F
mL, and the size of the penis remained unchanged.
& ^) G T3 y' h7 I# \: X# z- f0 C0 RThe mother also said that the boy was no longer hav- v1 z5 C* [& ~# p% _9 k
ing frequent erections.
* H# a' m2 a: `7 ?0 EBoth parents were again questioned about use of9 ^4 T0 F/ S6 T
any ointment/creams that they may have applied to/ B# r2 r+ R: u: a2 C
the child’s skin. This time the father admitted the
# c& F1 j. k' n8 ~0 G3 MTopical Testosterone Exposure / Bhowmick et al 541
& _, E$ L8 g- ^- o) c7 {$ \use of testosterone gel twice daily that he was apply-1 `; F: [9 z- c: P
ing over his own shoulders, chest, and back area for
# J! D# y9 [& z0 M$ Z) ra year. The father also revealed he was embarrassed4 U5 Z- f& |. r
to disclose that he was using a testosterone gel pre-: v7 r: f- o/ W! A
scribed by his family physician for decreased libido
% X8 k0 U. x# L7 ksecondary to depression.
6 a4 G1 s N$ yThe child slept in the same bed with parents.
* S& {$ t4 p" Y' u4 A4 {The father would hug the baby and hold him on his
9 D9 y; | ^+ u' _) Wchest for a considerable period of time, causing sig-
, Z2 X5 l$ A' d' b( J# M1 ynificant bare skin contact between baby and father.- Z# y1 L8 `" K- U: x& _
The father also admitted that after the phone call,
- j2 g7 n/ J: R `; X" }9 P/ S3 ywhen he learned the testosterone level in the baby7 f- ^4 b L, H
was high, he then read the product information0 ^0 _! q3 Y# g
packet and concluded that it was most likely the rea-6 T# r( d) A+ _/ E7 ~
son for the child’s virilization. At that time, they# q) x5 Y: F. U$ @! e. r
decided to put the baby in a separate bed, and the5 _0 Q' g! j: t! X; H
father was not hugging him with bare skin and had
) Z- U1 Z! ?2 ^5 T# M) @1 I8 Wbeen using protective clothing. A repeat testosterone
6 w: I% ^2 ~% C2 Ltest was ordered, but the family did not go to the
7 A8 D9 S; R5 Q: D9 C/ ulaboratory to obtain the test.
- g H( M2 ]7 ^5 S* S% sDiscussion5 W; C; _ H7 m5 ~
Precocious puberty in boys is defined as secondary" H l, f R% L" P
sexual development before 9 years of age.1,4! P( H1 f1 g) b! j
Precocious puberty is termed as central (true) when( P1 M4 B8 L" g
it is caused by the premature activation of hypo-
' V8 T) b' F* }% Zthalamic pituitary gonadal axis. CPP is more com-
! v' Q+ Z. ` s6 @8 Y0 r- Cmon in girls than in boys.1,3 Most boys with CPP5 x. V2 a( a+ d& L" q0 H( ?0 x
may have a central nervous system lesion that is* z& B j2 B6 S! M- g+ X( T1 Y; k7 Z
responsible for the early activation of the hypothal-
6 X- {$ D+ `* B: f& k Hamic pituitary gonadal axis.1-3 Thus, greater empha-* \) g( n* l1 y
sis has been given to neuroradiologic imaging in5 ?+ k. r! V& q7 |" h8 f& V
boys with precocious puberty. In addition to viril-
+ a6 u+ K6 Z0 l" Fization, the clinical hallmark of CPP is the symmet-
; Q7 d& C9 B6 }- Y9 T: c! grical testicular growth secondary to stimulation by
3 ]! E# @1 K- v( p+ k. Tgonadotropins.1,3
% z; y. W) {/ g5 x9 [Gonadotropin-independent peripheral preco-
$ v/ s7 o2 E" l2 T& u0 y7 Jcious puberty in boys also results from inappropriate
2 r+ K. u% x2 R, g/ L* s7 Fandrogenic stimulation from either endogenous or+ z6 r8 U* j9 Y& D3 K4 u% l# i/ ?
exogenous sources, nonpituitary gonadotropin stim-
1 J$ o4 u( R+ } U9 Y9 w. s: nulation, and rare activating mutations.3 Virilizing
" G/ [( c* P2 p& fcongenital adrenal hyperplasia producing excessive8 p" h( x* V$ R1 _
adrenal androgens is a common cause of precocious
' v: f% W9 [ h# N4 C$ |5 {puberty in boys.3,42 s3 c6 x' T4 V" c% a4 n) {$ R: z4 G
The most common form of congenital adrenal" l2 b+ F1 F- W+ _& w0 N! `3 p( c( s
hyperplasia is the 21-hydroxylase enzyme deficiency.: j: y0 G: y+ [, E- m! k9 y' L
The 11-β hydroxylase deficiency may also result in
! p1 v1 a! A4 y2 G) U' h+ p; gexcessive adrenal androgen production, and rarely,
2 z4 a; R1 O; Q/ S* ^5 |# j; [an adrenal tumor may also cause adrenal androgen: @- B) ], M# l4 I/ U
excess.1,35 _1 a9 k% A( D% s, O
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
" m& t6 \7 @0 m/ p2 s542 Clinical Pediatrics / Vol. 46, No. 6, July 2007* D- _4 v7 D' M" E X
A unique entity of male-limited gonadotropin-0 @ W1 L6 K, X8 T0 m7 S
independent precocious puberty, which is also known
1 N X2 p2 S. }as testotoxicosis, may cause precocious puberty at a
$ V7 ?- i h, q$ A8 t' Q7 zvery young age. The physical findings in these boys5 H5 y4 @8 J6 o: b
with this disorder are full pubertal development,
& s4 S2 h5 k- A |including bilateral testicular growth, similar to boys( @7 M8 T0 @9 E! M" C$ a
with CPP. The gonadotropin levels in this disorder
m6 @8 d' m& {- u; M9 Xare suppressed to prepubertal levels and do not show! B: |. D. z. U- r0 K/ i
pubertal response of gonadotropin after gonadotropin-
. K! X3 U: P4 i7 P$ c4 [! F$ Sreleasing hormone stimulation. This is a sex-linked
f2 D. i' q$ A' B9 j" x( Hautosomal dominant disorder that affects only
I3 \ R; J' @2 j4 l) r& C8 imales; therefore, other male members of the family
) t {6 G9 L: A3 y' \) g. l4 m8 Hmay have similar precocious puberty.3
/ h! J- `7 J/ m6 u8 x' M5 OIn our patient, physical examination was incon-
* d! M* ]7 O$ H* ^+ I- Ksistent with true precocious puberty since his testi-" [& ?4 @' ]6 \' {. W7 H0 H
cles were prepubertal in size. However, testotoxicosis
. I$ W- r& Q/ Mwas in the differential diagnosis because his father* \) Y9 A# {2 _. q
started puberty somewhat early, and occasionally,
6 \8 R$ a& T' t- E7 ?testicular enlargement is not that evident in the* w3 l h; x) c: E; S0 n2 V
beginning of this process.1 In the absence of a neg-
; l+ a+ Y1 I3 `+ @- J( G; [ative initial history of androgen exposure, our' }; w. Z: h+ I) I. b0 Q0 f; o
biggest concern was virilizing adrenal hyperplasia,
# r' z- q' [) F' m e9 ~/ seither 21-hydroxylase deficiency or 11-β hydroxylase
; S j% Z- Q- v* Ideficiency. Those diagnoses were excluded by find-
# v4 i( s6 ]: N5 ^+ O# [! e$ }9 Qing the normal level of adrenal steroids.6 L0 n. x. w5 Q' X3 C8 i- v
The diagnosis of exogenous androgens was strongly8 X: f4 Q R9 r% S/ |
suspected in a follow-up visit after 4 months because' P2 N. B9 x% C3 p% x% @/ J9 d+ W* c
the physical examination revealed the complete disap-
: l8 ^ Y4 s5 mpearance of pubic hair, normal growth velocity, and
, E$ _" a# d4 j8 e: |decreased erections. The father admitted using a testos-& O: |# V+ ?2 ]7 U0 B1 l3 O
terone gel, which he concealed at first visit. He was
3 J% O5 J* O Husing it rather frequently, twice a day. The Physicians’
* E4 Z6 o+ c0 |4 GDesk Reference, or package insert of this product, gel or
8 o7 g& J) o$ ]* e5 rcream, cautions about dermal testosterone transfer to* P6 d( ~# i; s. a1 {, f" H) ?
unprotected females through direct skin exposure.' E& t% `4 D0 F! m1 X9 T3 Y
Serum testosterone level was found to be 2 times the& }" e& Q7 B6 @, n( x
baseline value in those females who were exposed to6 x1 Z3 S9 Y( h( Z. P
even 15 minutes of direct skin contact with their male/ _$ j' w, x& `. ~+ {. `3 I& D- s0 ?
partners.6 However, when a shirt covered the applica-$ F; W8 c) T3 Y
tion site, this testosterone transfer was prevented.
% I% R, ?4 H/ o; x! k8 O& YOur patient’s testosterone level was 60 ng/mL,# @) c3 A) w! P5 N \/ q
which was clearly high. Some studies suggest that
. V2 l# p! d' R \1 |- hdermal conversion of testosterone to dihydrotestos-, k6 S8 a J* s
terone, which is a more potent metabolite, is more
' S& U' _2 f% w( u. t0 ~active in young children exposed to testosterone5 {" ~. U# v% J0 d3 u8 ?8 F
exogenously7; however, we did not measure a dihy-
+ U- X5 s4 I: B: @# w: U2 Fdrotestosterone level in our patient. In addition to
# I: C" [; c" T- S# ?2 c N! Dvirilization, exposure to exogenous testosterone in3 ?* R! u; T. P
children results in an increase in growth velocity and ?5 G6 {2 m5 {! `
advanced bone age, as seen in our patient.7 ^0 r% c+ ~6 j5 X9 g6 c
The long-term effect of androgen exposure during
! i( {" m( ?- y" _7 o0 mearly childhood on pubertal development and final7 @" ^# z. I5 o" h1 @
adult height are not fully known and always remain
( b9 _( e! g; k$ x- Ea concern. Children treated with short-term testos-
W& J- F) P: k" eterone injection or topical androgen may exhibit some, R; L) K9 F7 L
acceleration of the skeletal maturation; however, after
, p% `2 e' `$ Q; xcessation of treatment, the rate of bone maturation
7 p7 s! U0 x- J6 vdecelerates and gradually returns to normal.8,9
, X: u# \9 c8 s/ ]; QThere are conflicting reports and controversy
9 ?; {; B% S5 q$ Q; E7 Iover the effect of early androgen exposure on adult
. r" E) z! E/ a5 rpenile length.10,11 Some reports suggest subnormal
) x. y$ S& V) }8 r1 jadult penile length, apparently because of downreg-; L9 V( D0 N/ ]7 H4 m3 S. K
ulation of androgen receptor number.10,12 However,/ b$ q4 |( P1 |' v K9 _: l
Sutherland et al13 did not find a correlation between
6 p3 r0 }) B/ k7 Xchildhood testosterone exposure and reduced adult" d. \" b) i2 L# w' h4 y; E4 o
penile length in clinical studies.
1 ? w$ ~4 K) z3 q: ` ]Nonetheless, we do not believe our patient is
' A1 I* ^! Q& z1 C7 q6 h- dgoing to experience any of the untoward effects from0 Q' B# X3 x" N9 X1 f: G
testosterone exposure as mentioned earlier because
7 V: `/ L7 Y# x' F0 u1 `1 ythe exposure was not for a prolonged period of time.
9 ?0 S* {0 Q% K) e/ N# C, EAlthough the bone age was advanced at the time of
2 m6 b+ K2 L9 L$ D y8 W+ {& T) udiagnosis, the child had a normal growth velocity at
- r0 ]3 S6 H- u1 P: P `, _; athe follow-up visit. It is hoped that his final adult
; E, K/ `+ Q5 P; V0 l e- ]height will not be affected.7 k) S* Z9 h, z8 w
Although rarely reported, the widespread avail-. n; t& V M6 Q+ b
ability of androgen products in our society may/ u+ a, s7 X% A. z6 g) A" H1 d
indeed cause more virilization in male or female
8 ~7 r- \3 D+ e" h& D5 {& hchildren than one would realize. Exposure to andro-
/ o5 e; M3 C- Z; d: {7 _gen products must be considered and specific ques-; a w# D6 W, E" Z, k& H
tioning about the use of a testosterone product or
. p6 g0 `4 w$ p9 n* jgel should be asked of the family members during
/ D$ J' l" I- R# S( u( `- @8 jthe evaluation of any children who present with vir-
# |* z+ `. |, H3 O; q+ Qilization or peripheral precocious puberty. The diag-
2 a+ S! d3 [: p- p9 s/ r: @nosis can be established by just a few tests and by
- A% L9 W. W X% kappropriate history. The inability to obtain such a- s! i, O7 Z) x$ ?+ X$ f
history, or failure to ask the specific questions, may. @, E1 C ` f. j
result in extensive, unnecessary, and expensive9 D8 C% n/ t7 ~9 y6 ^ N2 z
investigation. The primary care physician should be
8 H( I0 ]( Z; N7 V' M/ Faware of this fact, because most of these children* H% s6 ^0 G0 R2 t5 S- x( w
may initially present in their practice. The Physicians’! o7 m) ^& F0 {* b; S
Desk Reference and package insert should also put a0 c! s! F C2 K+ d
warning about the virilizing effect on a male or
% o1 q9 n* w0 Cfemale child who might come in contact with some-
9 r% F9 f" p" w d- h! Zone using any of these products.2 Z! V9 ^8 ^0 q2 A
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